More than 90 percent of nurses surveyed said they have been involved, or nearly involved, in cases of medical malpractice, according to an interim report by a nationwide medical union released Wednesday.

The 174,000-member Japan Federation of Medical Workers Unions stated in a report based on the survey that 93.9 percent of nurses polled admitted to inadvertent involvement, or near-involvement in cases of malpractice, such as providing patients with the wrong injection or medication.

The survey was conducted between August and October and covered some 100,000 members of the federation, which accounts for about 10 percent of all registered nurses nationwide. The interim report covers only 12,000 of those 100,000.